# A/B testing guides

> Practical answers to the questions people ask before they run A/B tests: which tool fits their site and their AI agent, how to install it without flicker, and how to trust the numbers. Each guide says when another tool is the better fit.

Last reviewed: 2026-10-29 · HTML version: https://duelpilot.com/guides

### [How to run A/B tests on your website with Claude](https://duelpilot.com/guides/ab-testing-with-claude)

Connect an A/B testing tool to Claude, Claude Code or Cursor over MCP: the connector, the routines, a Next.js install, and what the agent may do.

### [How ChatGPT can run A/B tests on your website](https://duelpilot.com/guides/ab-testing-with-chatgpt)

Add an A/B testing tool to ChatGPT as a custom MCP connector, let it install, design and watch tests, and keep launches with a person. Steps and limits.

### [How to A/B test a Shopify store](https://duelpilot.com/guides/shopify-ab-testing)

How to A/B test a Shopify store: Shopify Rollouts for whole themes, Intelligems or Shoplift for prices and shipping, a theme script for storefront content.

### [The best A/B testing plugin or tool for WordPress](https://duelpilot.com/guides/wordpress-ab-testing)

Two ways to A/B test WordPress: a plugin such as Nelio A/B Testing, or a script in wp\_head such as Duelpilot. Plus the WP Rocket and LiteSpeed settings.

### [How to A/B test a Webflow site](https://duelpilot.com/guides/webflow-ab-testing)

Three ways to A/B test Webflow: Webflow Optimize, Optibase, or a script in Head code such as Duelpilot, run by your AI agent, and how to install it.

### [How to run A/B tests in Next.js without flicker](https://duelpilot.com/guides/nextjs-ab-testing)

How to A/B test in Next.js without flicker: server-side flags, proxy rewrites, Vercel's precompute pattern, or a hydration-safe script such as Duelpilot.

### [How to see A/B test results in Google Analytics 4](https://duelpilot.com/guides/ga4-ab-test-results)

See A/B test variants in GA4: the experience\_impression event, an exp\_variant\_string custom dimension, explorations, audiences, and how Duelpilot does it.

### [A/B testing for agencies with many client websites](https://duelpilot.com/guides/ab-testing-for-agencies)

A/B testing for an agency with many client websites: per-client workspaces, roles, brand and guardrails per site, flat pricing, and what's missing.

### [Can you check A/B test results every day? Peeking and sequential testing explained](https://duelpilot.com/guides/sequential-testing)

Can you check A/B test results daily? Why peeking breaks fixed-horizon tests, how sequential, always-valid statistics fix it, and which tools use them.

### [Sample ratio mismatch (SRM): what it is and which tools check for it](https://duelpilot.com/guides/sample-ratio-mismatch)

What a sample ratio mismatch (SRM) is, why it invalidates an A/B test, its common causes, how to test for it, and which tools check for it automatically.

### [How A/B testing tools avoid flicker without slowing down your website](https://duelpilot.com/guides/ab-testing-flicker)

Why client-side A/B tests flicker, how synchronous scripts, anti-flicker snippets with timeouts and server-side tests prevent it, and what each costs.

### [GDPR-friendly A/B testing without cookies: what EU websites should check](https://duelpilot.com/guides/gdpr-ab-testing)

What GDPR and ePrivacy mean for A/B testing on EU sites, why no cookies isn't the whole answer, and what to check: storage, consent, DPA and hosting.

## Background

### [Agentic A/B testing](https://duelpilot.com/agentic-ab-testing)

What it is, why it's happening now, and what to look for in a tool.

### [Best A/B testing tools in 2026](https://duelpilot.com/best-ab-testing-tools)

Every tool we track, by who it is best for.

### [A/B testing MCP servers](https://duelpilot.com/mcp-ab-testing)

Which testing tools your AI agent can connect to, and how.

## Try Duelpilot with your own agent

Give your agent one line: [set up Duelpilot for my site using /agents.md](https://duelpilot.com/agents.md). It opens a workspace, installs and verifies the script, and drafts the first test; you approve it, then switch on autopilot if you like. Or [see pricing](https://duelpilot.com/#pricing).

**[Start for €0](https://duelpilot.com/login) · [Give it to your agent](https://duelpilot.com/#start)** (€0 until you launch your first test)

## Related

- [All comparisons](https://duelpilot.com/compare)
- [Agentic A/B testing explained](https://duelpilot.com/agentic-ab-testing)